<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>产品注册</title>
<style type="text/css">
html,body{height:100%;}
body{padding:0;margin:0;}
.main{height:100%;text-align: center;}
#top{height:50px;width:900px;background-color:#CCC;color:#fff;}
#autoHeight{position:relative;top:0;bottom:0;
height:expression((document.body.clientHeight - 50) + "px");
width:900px;background-color:#999;color:#fff;}
</style>
</head>
<body>
<div class="main">
<div id="top">top</div>
<div id="autoHeight">autoHeight</div>
</div>
</body>
</html>
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